18,000 years ago, global temperatures were about 5ºC lower than the 20th century average. That was enough to put Canada, Scandinavia, and half of England and the US under a half a mile of ice. That’s what 5ºC can do.8

100 million years ago, temperatures were 6-10ºC higher than they are now—and there were palm trees on the poles, no permanent ice anywhere, ocean levels were 200 meters higher, and this kind of shit was happening:

So we’re currently in this not-that-big window we probably should try to stay in:

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Railtown — The Book

Ethan's book Railtown covers the history of the Los Angeles Metro Rail system.

Railtown presents the history of this system by drawing on archival documents, contemporary news accounts, and interviews with many of the key players to provide critical behind-the-scenes accounts of the people and forces that shaped the system.